应用操作-各种类型的调试

乐宝宝 2021-04-01 AM 1095℃ 0条

####调试各种类型
```html
#define IS_UNDEF                                        0
#define IS_NULL                                         1
#define IS_FALSE                                        2
#define IS_TRUE                                         3
#define IS_LONG                                         4
#define IS_DOUBLE                                       5
#define IS_STRING                                       6
#define IS_ARRAY                                        7
#define IS_OBJECT                                       8
#define IS_RESOURCE                                     9
#define IS_REFERENCE                                    10
```
####首先先编译，要有debug的功能选项
```html
./configure --prefix=/home/jack/Desktop/php-7.1.0/output/ --enable-fpm --enable-debug
```
####新建一个PHP文件，命名为index.php
```html
<?php
$a = 2;
echo $a;
$b =1.1;
echo $b;
$c = null;
echo $c;
$d = true;
echo $d;
$e = false;
echo $e;
$f = "string";
echo $f;
$g = [1,2,3];
echo $g;
$h = new stdclass();
echo $h;
```
####php执行目录
```html
/home/jack/Desktop/php-7.1.0/output/bin/php
```
####gdb 调试
```html
[root@192 test]# gdb /home/jack/Desktop/php-7.1.0/output/bin/php
GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-80.el7
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /home/jack/Desktop/php-7.1.0/output/bin/php...done.
```
####打断点
```html
(gdb) b ZEND_ECHO_SPEC_CV_HANDLER
Breakpoint 1 at 0x8f607e: file /home/jack/Desktop/php-7.1.0/Zend/zend_vm_execute.h, line 34640.
```
####执行index.php
```html
(gdb) r index.php
Starting program: /home/jack/Desktop/php-7.1.0/output/bin/php index.php
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Breakpoint 1, ZEND_ECHO_SPEC_CV_HANDLER () at /home/jack/Desktop/php-7.1.0/Zend/zend_vm_execute.h:34640
34640		SAVE_OPLINE();
Missing separate debuginfos, use: debuginfo-install glibc-2.17-105.el7.x86_64 libxml2-2.9.1-6.el7.4.x86_64 nss-softokn-freebl-3.16.2.3-13.el7_1.x86_64 xz-libs-5.2.2-1.el7.x86_64 zlib-1.2.7-18.el7.x86_64
```
####继续执行
```html
(gdb) n
34641		z = _get_zval_ptr_cv_undef(execute_data, opline->op1.var);
(gdb) n
34643		if (Z_TYPE_P(z) == IS_STRING) {
(gdb) p z
$1 = (zval *) 0x7ffff5e14080

# 执行第一个参数$a = 2;很明显lval的值是2
(gdb) p *z
$2 = {value = {lval = 2, dval = 9.8813129168249309e-324, counted = 0x2, str = 0x2, arr = 0x2, obj = 0x2, 
    res = 0x2, ref = 0x2, ast = 0x2, zv = 0x2, ptr = 0x2, ce = 0x2, func = 0x2, ww = {w1 = 2, w2 = 0}}, u1 = {
    v = {type = 4 '\004', type_flags = 0 '\000', const_flags = 0 '\000', reserved = 0 '\000'}, type_info = 4}, 
  u2 = {next = 0, cache_slot = 0, lineno = 0, num_args = 0, fe_pos = 0, fe_iter_idx = 0, access_flags = 0, 
    property_guard = 0}}
```
####继续执行
```html
(gdb) c
Continuing.
2
Breakpoint 1, ZEND_ECHO_SPEC_CV_HANDLER ()
    at /home/jack/Desktop/php-7.1.0/Zend/zend_vm_execute.h:34640
34640		SAVE_OPLINE();
(gdb) n
34641		z = _get_zval_ptr_cv_undef(execute_data, opline->op1.var);
(gdb) p z
$3 = (zval *) 0x7ffff5e14090
```
####执行$b = 1.1; v = {type = 5 '\005', 看到type是5，代表着的意思是IS_DOUBLE，所以他的值是dval = 1.1000000000000001, 表示精度问题
```html
(gdb) p *z
$4 = {value = {lval = 4607632778762754458, dval = 1.1000000000000001, 
    counted = 0x3ff199999999999a, str = 0x3ff199999999999a, 
    arr = 0x3ff199999999999a, obj = 0x3ff199999999999a, 
    res = 0x3ff199999999999a, ref = 0x3ff199999999999a, 
    ast = 0x3ff199999999999a, zv = 0x3ff199999999999a, 
    ptr = 0x3ff199999999999a, ce = 0x3ff199999999999a, 
    func = 0x3ff199999999999a, ww = {w1 = 2576980378, w2 = 1072798105}}, u1 = {
    v = {type = 5 '\005', type_flags = 0 '\000', const_flags = 0 '\000', 
      reserved = 0 '\000'}, type_info = 5}, u2 = {next = 0, cache_slot = 0, 
    lineno = 0, num_args = 0, fe_pos = 0, fe_iter_idx = 0, access_flags = 0, 
    property_guard = 0}}
```
####继续执行
```html
(gdb) c
Continuing.
1.1
Breakpoint 1, ZEND_ECHO_SPEC_CV_HANDLER ()
    at /home/jack/Desktop/php-7.1.0/Zend/zend_vm_execute.h:34640
34640		SAVE_OPLINE();
(gdb) n
34641		z = _get_zval_ptr_cv_undef(execute_data, opline->op1.var);
(gdb) n
34643		if (Z_TYPE_P(z) == IS_STRING) {
(gdb) p z
$5 = (zval *) 0x7ffff5e140a0
```
####执行$c = null;u1 = {v = {type = 1 '\001',对应的是IS_NULL  
```html
(gdb) p *z
$6 = {value = {lval = 17785152, dval = 8.7870326092647377e-317, 
    counted = 0x10f6140, str = 0x10f6140, arr = 0x10f6140, obj = 0x10f6140, 
    res = 0x10f6140, ref = 0x10f6140, ast = 0x10f6140, zv = 0x10f6140, 
    ptr = 0x10f6140, ce = 0x10f6140, func = 0x10f6140, ww = {w1 = 17785152, 
      w2 = 0}}, u1 = {v = {type = 1 '\001', type_flags = 0 '\000', 
      const_flags = 0 '\000', reserved = 0 '\000'}, type_info = 1}, u2 = {
    next = 0, cache_slot = 0, lineno = 0, num_args = 0, fe_pos = 0, 
    fe_iter_idx = 0, access_flags = 0, property_guard = 0}}
```
####继续执行
```html
(gdb) c
Continuing.

Breakpoint 1, ZEND_ECHO_SPEC_CV_HANDLER ()
    at /home/jack/Desktop/php-7.1.0/Zend/zend_vm_execute.h:34640
34640		SAVE_OPLINE();
(gdb) n
34641		z = _get_zval_ptr_cv_undef(execute_data, opline->op1.var);
(gdb) n
34643		if (Z_TYPE_P(z) == IS_STRING) {
(gdb) p z
$11 = (zval *) 0x7ffff5e140d0
```
####执行的是string,他的值在str中，可以直接获取str中的值
```html
(gdb) p *z
$12 = {value = {lval = 17730720, dval = 8.7601396280303069e-317, 
    counted = 0x10e8ca0, str = 0x10e8ca0, arr = 0x10e8ca0, obj = 0x10e8ca0, 
    res = 0x10e8ca0, ref = 0x10e8ca0, ast = 0x10e8ca0, zv = 0x10e8ca0, 
    ptr = 0x10e8ca0, ce = 0x10e8ca0, func = 0x10e8ca0, ww = {w1 = 17730720, 
      w2 = 0}}, u1 = {v = {type = 6 '\006', type_flags = 0 '\000', 
      const_flags = 0 '\000', reserved = 0 '\000'}, type_info = 6}, u2 = {
    next = 0, cache_slot = 0, lineno = 0, num_args = 0, fe_pos = 0, 
    fe_iter_idx = 0, access_flags = 0, property_guard = 0}}
(gdb) p $12.value.str
$13 = (zend_string *) 0x10e8ca0
(gdb) p *$12.value.str
$14 = {gc = {refcount = 1, u = {v = {type = 6 '\006', flags = 7 '\a', 
        gc_info = 0}, type_info = 1798}}, h = 9223378990886268924, len = 6, 
  val = "s"}
```
####可以看到他的长度是6  
```html
(gdb) p *$12.value.str.val@6
$15 = "string" 
```
####继续执行
```html
(gdb) c
Continuing.
string
Breakpoint 1, ZEND_ECHO_SPEC_CV_HANDLER ()
    at /home/jack/Desktop/php-7.1.0/Zend/zend_vm_execute.h:34640
34640		SAVE_OPLINE();
(gdb) n
34641		z = _get_zval_ptr_cv_undef(execute_data, opline->op1.var);
(gdb) n
34643		if (Z_TYPE_P(z) == IS_STRING) {
(gdb) p z
$16 = (zval *) 0x7ffff5e140e0
(gdb) p *z
$17 = {value = {lval = 140737318848000, dval = 6.953347433060256e-310, 
    counted = 0x7ffff5e58600, str = 0x7ffff5e58600, arr = 0x7ffff5e58600, 
    obj = 0x7ffff5e58600, res = 0x7ffff5e58600, ref = 0x7ffff5e58600, 
    ast = 0x7ffff5e58600, zv = 0x7ffff5e58600, ptr = 0x7ffff5e58600, 
    ce = 0x7ffff5e58600, func = 0x7ffff5e58600, ww = {w1 = 4125459968, 
      w2 = 32767}}, u1 = {v = {type = 7 '\a', type_flags = 28 '\034', 
      const_flags = 0 '\000', reserved = 0 '\000'}, type_info = 7175}, u2 = {
    next = 0, cache_slot = 0, lineno = 0, num_args = 0, fe_pos = 0, 
    fe_iter_idx = 0, access_flags = 0, property_guard = 0}}
```
####对应的是数组，对应的是value里面的arr
```html
(gdb) p $17.value.arr
$18 = (zend_array *) 0x7ffff5e58600
(gdb) p *$17.value.arr
$19 = {gc = {refcount = 2, u = {v = {type = 7 '\a', flags = 0 '\000', 
        gc_info = 0}, type_info = 7}}, u = {v = {flags = 30 '\036', 
      nApplyCount = 0 '\000', nIteratorsCount = 0 '\000', 
      consistency = 0 '\000'}, flags = 30}, nTableMask = 4294967294, 
  arData = 0x7ffff5e5eb48, nNumUsed = 3, nNumOfElements = 3, nTableSize = 8, 
  nInternalPointer = 0, nNextFreeElement = 3, 
  pDestructor = 0x84d32c <_zval_ptr_dtor_wrapper>}
```
####继续执行
```html
(gdb) c 
Continuing.
Array
Breakpoint 1, ZEND_ECHO_SPEC_CV_HANDLER ()
    at /home/jack/Desktop/php-7.1.0/Zend/zend_vm_execute.h:34640
34640		SAVE_OPLINE();
(gdb) n
34641		z = _get_zval_ptr_cv_undef(execute_data, opline->op1.var);
(gdb) n
34643		if (Z_TYPE_P(z) == IS_STRING) {
(gdb) p z
$20 = (zval *) 0x7ffff5e140f0
(gdb) p *z
$21 = {value = {lval = 140737318974880, dval = 6.9533474393289609e-310, 
    counted = 0x7ffff5e775a0, str = 0x7ffff5e775a0, arr = 0x7ffff5e775a0, 
    obj = 0x7ffff5e775a0, res = 0x7ffff5e775a0, ref = 0x7ffff5e775a0, 
    ast = 0x7ffff5e775a0, zv = 0x7ffff5e775a0, ptr = 0x7ffff5e775a0, 
    ce = 0x7ffff5e775a0, func = 0x7ffff5e775a0, ww = {w1 = 4125586848, 
      w2 = 32767}}, u1 = {v = {type = 8 '\b', type_flags = 12 '\f', 
      const_flags = 0 '\000', reserved = 0 '\000'}, type_info = 3080}, u2 = {
    next = 0, cache_slot = 0, lineno = 0, num_args = 0, fe_pos = 0, 
    fe_iter_idx = 0, access_flags = 0, property_guard = 0}}
```
####对象类型 
```html
(gdb) p $21.value.obj
$22 = (zend_object *) 0x7ffff5e775a0
(gdb) p *$21.value.obj
$23 = {gc = {refcount = 1, u = {v = {type = 8 '\b', flags = 0 '\000', 
        gc_info = 0}, type_info = 8}}, handle = 1, ce = 0x1121d80, 
  handlers = 0x10b1a20 <std_object_handlers>, properties = 0x0, 
  properties_table = {{value = {lval = 0, dval = 0, counted = 0x0, str = 0x0, 
        arr = 0x0, obj = 0x0, res = 0x0, ref = 0x0, ast = 0x0, zv = 0x0, 
        ptr = 0x0, ce = 0x0, func = 0x0, ww = {w1 = 0, w2 = 0}}, u1 = {v = {
          type = 40 '(', type_flags = 0 '\000', const_flags = 0 '\000', 
          reserved = 0 '\000'}, type_info = 40}, u2 = {next = 0, 
        cache_slot = 0, lineno = 0, num_args = 0, fe_pos = 0, fe_iter_idx = 0, 
        access_flags = 0, property_guard = 0}}}}
```

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8年161天

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你的好对别人来说就像一颗糖，吃了就没了，而你的不好就像一道疤，会永远存在。2021年11月25日 14:36:34
有钱把事做好，没钱把人做好，蛇不知道自己有毒，人不知道自己有错。2021年11月25日 14:35:51
我现在不和别人争吵了，因为我开始意识到每个人只能站在自己的认知角度上去思考，所以如果有人跟你说地球是方的，你只需要笑着对她说："是的，你真厉害"2021年11月25日 14:34:50
持续学习，打造自己的影响力，一只站在树上的鸟儿，从来不会害怕树枝断裂，因为她相信的不是树枝，而是它自己的翅膀。2021年09月18日 09:23:40
老天很公平，给了所有人同样多的时间，而有的人能够把时间用好，有的人则没有把时间用好。日积月累，人和人的差距就越来越大了2021年09月17日 14:05:16
会挣钱的人一定是会投资的人。我一直认为，最宝贵的财富并不是钱，而是你的时间，时间比钱更宝贵，因为钱你不用还在那里，而时间你不用就浪费掉了。你把你的时间投资在哪些地方，就意味着你未来会走什么样的路。所以，利用好你的时间，投到一些有意义的地方吧。 2021年07月21日 11:52:57
傍晚在路上看见了小学同学正在捡矿泉水瓶子，心理很不是滋味....想不到昔日的玩伴如今竟成了竞争对手。2021年06月24日 10:13:16
有些公司缺乏统一完整的IT方向，希望上短平快的项目，立竿见影，跳过系统的一些必要发展阶段，导致系统后继无力，不了了之。由于方向不明确，企业内部充斥着各种各样满足于战术内容的小体系，并不能给企业带来大的好处。2021年06月16日 09:54:07
再长的路，一步步也能走完；再短的路，不迈开双脚也无法到达。还在咬牙坚持的你，请不要泄气。你的日积月累，早晚会成为别人的望尘莫及。2020年03月27日 08:47:23
成就一番伟业的唯一途径就是热爱自己的事业。如果你还没能找到让自己热爱的事业，继续寻找，不要放弃。跟随自己的心，总有一天你会找到的。2020年01月08日 14:07:09
其实世界上没有那么多的如果，有时候，我们一瞬间失去的东西就是永恒。2019年12月30日 17:02:04
井蛙不知道大海，被空间维度所限制；夏虫不知道冬天，是被时间维度所限制；圈养的动物没有斗志，是被自己意识所限制。2019年12月20日 13:46:32
不管环境多么纵容你，都要对自己有要求，保持自律的气质。或许它暂时不能改变你的现状，但假以时日，它回馈的一定让你惊喜。对自己有要求的人，总不会过得太差。2019年12月13日 15:22:55
被拒的，不是年龄，是埋头苦干的时候，没有抬头看一看世界，没有继续学习，一直吃老本，有点像高速公路下岗的收费人员，再找工作，技术却不比别人强，但要求的薪资却比别人高，反倒是这个年龄，觉得自己年龄大，就应该高一些2019年12月12日 13:58:53
懂得越多，越发觉懂得越少。2019年12月11日 23:37:41

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应用操作-各种类型的调试

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